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Results of hip resurfacing
Francesco Falez1, Fabio Favetti, Filippo Casella
1Ortopedia e Traumatologia, Ospedale Santo Spirito, Rome, Italy. francesco.falez@francescofalez.it
International Orthopaedics
|January 15, 2011
Summary
High-viscosity cement ensures even distribution for resurfacing hip arthroplasty, reducing risks of femoral head complications like avascular necrosis and fracture.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Implant technology
Background:
- Resurfacing hip arthroplasty has seen increased use, with documented early revision rates.
- Avascular necrosis and femoral neck fracture are key complications linked to these implants.
- Cementing technique is a suspected, yet not fully proven, cause of failure.
Purpose of the Study:
- To investigate the impact of cement viscosity and application technique on femoral head coverage.
- To evaluate potential risks associated with cement distribution in resurfacing hip arthroplasty.
Main Methods:
- An in vitro study using simulated femoral heads and four different resurfacing implants.
- Evaluation of two cement viscosities (low and high) and two cementing techniques (direct and indirect).
Main Results:
- High-viscosity cement demonstrated homogeneous distribution across the entire simulated femoral head.
- Low-viscosity cement resulted in concentrated polar distribution, with poor equatorial coverage.
Conclusions:
- Uneven cement distribution, particularly polar concentration, may increase early implant failure risk.
- Potential risks include biological effects (osteocyte necrosis from exothermic reaction) and biomechanical issues (uneven load distribution).